Canon MF4690 Service Manual - Page 41
Basic Constraction
UPC - 013803076820
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3.1 Basic Constraction 3.1.1 Specifications / Control / Function List item function / method T-3-1 document exposure LED document scan Book mode: scan by the shift of the contact Book mode: scan by the shift of the contact sensor (CS) ADF: document stream reading by fixed contact sensor (CS) scanning resolution 600 dpi (horizontal scanner) X 600 dpi (vertical scanner) number of gradations 256 gradations magnification 50% to 200% horizontal: image processing by SCNT board vertical: change of carriage shift speed, image processing by SCNT board lens rod lens array CMOS sensor number of lines: 1 line number of pixels: 5184 pixels as total pixels (5107 pixels as effective pixels) maximum document scanning width: 216 mm CS drive control drive control by Book motor (M2) CS HP detection Yes document size detection none Dirt sensor detection Yes Chapter 3 0016-1813 3.1.2 Major Components 0016-1815 Followings are the major components for Document Exposure System. - The contact sensor to scan document - The Book motor (M2), the drive pulley, the drive belt, to shift the contact sensor In image scanning control, the contact sensor is shifted by rotating the Book motor based on the drive signal from the DCNT board and scan the original on the copyboard glass. When ADF is in use, image is scanned by feeding the originals by ADF instead of shifting the contact sensor. 3-1